linux-kernel - [PATCH v2 2/3] iio: adc: ina2xx: Use LSB specifier instead of divider in config

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Date:   Sat, 28 Oct 2017 23:12:47 +0200
From:   Stefan Brüns <stefan.bruens@...h-aachen.de>
To:     <linux-iio@...r.kernel.org>
CC:     Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Stefan Brüns <stefan.bruens@...h-aachen.de>,
        <linux-kernel@...r.kernel.org>, "Andrew F . Davis" <afd@...com>,
        "Lars-Peter Clausen" <lars@...afoo.de>,
        Jonathan Cameron <jic23@...nel.org>,
        "Hartmut Knaack" <knaack.h@....de>,
        Javier Martinez Canillas <javier@....samsung.com>
Subject: [PATCH v2 2/3] iio: adc: ina2xx: Use LSB specifier instead of divider in config

While the config uses the physical value corresponding to the LSB
for both the power and the bus voltage register, the shunt voltage is
specified as parts of 1 mV. Use the LSB physical value for all registers.

No functional change.

Signed-off-by: Stefan Brüns <stefan.bruens@...h-aachen.de>

---

Changes in v2:
- new patch

 drivers/iio/adc/ina2xx-adc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 84094235ff7e..c59843de3999 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -115,7 +115,7 @@ enum ina2xx_ids { ina219, ina226 };
 struct ina2xx_config {
 	u16 config_default;
 	int calibration_factor;
-	int shunt_div;
+	int shunt_voltage_lsb;	/* nV */
 	int bus_voltage_shift;	/* position of lsb */
 	int bus_voltage_lsb;	/* uV */
 	int power_lsb;		/* uW */
@@ -138,7 +138,7 @@ static const struct ina2xx_config ina2xx_config[] = {
 	[ina219] = {
 		.config_default = INA219_CONFIG_DEFAULT,
 		.calibration_factor = 40960000,
-		.shunt_div = 100,
+		.shunt_voltage_lsb = 10000,
 		.bus_voltage_shift = INA219_BUS_VOLTAGE_SHIFT,
 		.bus_voltage_lsb = 4000,
 		.power_lsb = 20000,
@@ -147,7 +147,7 @@ static const struct ina2xx_config ina2xx_config[] = {
 	[ina226] = {
 		.config_default = INA226_CONFIG_DEFAULT,
 		.calibration_factor = 5120000,
-		.shunt_div = 400,
+		.shunt_voltage_lsb = 2500,
 		.bus_voltage_shift = 0,
 		.bus_voltage_lsb = 1250,
 		.power_lsb = 25000,
@@ -204,9 +204,9 @@ static int ina2xx_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->address) {
 		case INA2XX_SHUNT_VOLTAGE:
-			/* processed (mV) = raw/shunt_div */
-			*val2 = chip->config->shunt_div;
-			*val = 1;
+			/* processed (mV) = raw * lsb(nV) / 1000000 */
+			*val = chip->config->shunt_voltage_lsb;
+			*val2 = 1000000;
 			return IIO_VAL_FRACTIONAL;
 
 		case INA2XX_BUS_VOLTAGE:
-- 
2.14.3